factory constructor ManagedDataModelException.emptyEntityUniqueProperties

Source

factory ManagedDataModelException.emptyEntityUniqueProperties(
    ManagedEntity entity) {
  return new ManagedDataModelException("Type '${_getPersistentClassName(entity)}' "
      "has empty set for unique 'ManagedTableAttributes'. Must contain two or "
      "more attributes (or belongs-to relationship properties).");
}